A look at some of their statements and how they compare with the facts:
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BETO O'ROURKE, former U.S. representative from Texas: "That's how you explain an economy that is rigged to corporations and the very wealthiest. A 2 trillion-dollar-tax cut that favored corporations while they were sitting on record piles of cash and the very wealthiest in this country at a time of historic wealth inequality."
THE FACTS: The tax cut wasn't quite that big: The Joint Committee on Taxation estimates that it will reduce tax revenues by $1.5 trillion over the next decade. Individuals will actually receive the bulk of those cuts, getting $1.1 trillion while businesses get $654 billion, offset by higher tax revenues from changes to international tax law. The tax cuts did mostly favor richer Americans: The top one-fifth of income earners got 65% of the benefit from the tax cuts, with just 1% going to the poorest one-fifth, according to the nonpartisan Tax Policy Center.
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JAY INSLEE, Washington's governor: "We are the first generation to feel the sting of climate change and we are the last that can do something about it. ... It is our last chance in an administration, next one, to do something about it."
THE FACTS: Not quite. This answer implies that after 2025 or 2029, when whoever is elected in 2020 leaves office, it will be too late to fight or limit climate change.
That's a common misconception that stemmed from a U.N. scientific report that came out last fall, which talked about 2030, mostly because that's a key date in the Paris climate agreement. The report states that with every half a degree Celsius and with every year, global warming and its dangers get worse. However, it does not say at some point it is too late.
"The hotter it gets the worse it gets but there is no cliff edge," James Skea, co-chairman of the report and professor of sustainable energy at Imperial College London, told The Associated Press.
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The report co-author, Swiss climate scientist Sonia I. Seneviratne this month tweeted, "Many scientists point - rightfully - to the fact that we cannot state with certainty that climate would suddenly go berserk in 12 years if we weren't doing any climate mitigation. But who can state with certainty that we would be safe beyond that stage or even before that?"
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O'ROURKE, referring to the international climate goal: "If all of us does all that we can, then we're going to be able to keep this planet from warming another 2 degrees Celsius and ensure that we match what this country can do and live up to our promise and our potential."
THE FACTS: O'Rourke gets the climate goal wrong.
Since 2009, international summits and the Paris climate agreement list the overarching goal as limiting climate change to no more than 2 degrees Celsius (3.6 degrees Fahrenheit) from pre-industrial times. That's somewhere between 1850 and 1880, depending on who is calculating.
There's a big difference because since pre-industrial times, Earth has already warmed 1 degree Celsius (1.8 degrees Fahrenheit). So the world community is talking about 1 degree Celsius from now and O'Rourke is talking about twice that.
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JULIAN CASTRO, former federal housing secretary: "I would do several things, starting with something we should have done a long time ago, which is to pass the Equal Rights Amendment, finally, in this country. And, also, pursue legislation so that women are paid equal pay for equal work in this country."
THE FACTS: It would be past time if it hadn't already happened. It has been illegal to pay men more than women for the same work, or vice versa, since the passage of the Equal Pay Act in 1963. Disparities, however, persist despite the law.
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TIM RYAN, U.S. representative from Ohio: "The bottom 60% haven't seen a raise since 1980. The top 1% control 90% of the wealth."
THE FACTS: Those figures exaggerate the state of income and wealth inequality. While few studies single out the bottom 60%, the Congressional Budget Office calculates that the bottom 80% of Americans have seen their incomes rise 32% since 1979. That is certainly lower than the doubling of income enjoyed by the top one-fifth of income earners. And the richest 1% possess 32% of the nation's wealth, according to data from the Federal Reserve , not 90%.