The fundraisers, which start at $2,300 per person, with amounts above $4,600 going to the party, are for his presidential bid and for the Democratic party.
Trial lawyer Richard Mithoff and his philanthropist wife, Ginni, and energy company chief John Thrash and his philanthropist wife, Becca Cason Thrash are hosting the receptions.
Earlier this year, about 20,000 or more people attended a free, public rally in Houston during Obama's campaign for the Texas presidential primary March 4.
The Illinois senator will be campaigning first in Cedar Rapids, Iowa, which is considered up for grabs.
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