He smiled and added, "Goal scorers want to score, so it's good to make them go home happy."
Donovan did a fine job of finishing on a pair of picture-perfect passes from Beckham.
Donovan made a sliding shot in the 84th minute to even it. His earlier goal, on a diving header in the 67th minute, had tied it 1-1.
Franco Caraccio had a goal and an assist for the two-time defending MLS champion Dynamo (0-1-3), still looking for their first win of the season. Caraccio gave Houston a 2-1 lead in the 79th minute when he kicked in a rebound of Brian Ching's shot that bounced off the crossbar.
Donovan's second goal, his fifth of the season, came when Beckham dribbled down the right side of the box, rolled the ball across to him near the left post, and he got his foot on it to beat goalie Tony Caig.
Beckham set up Donovan's score in the 67th minute with a perfect cross from the right wing. Beckham sent the ball low and close to the goal line and Donovan, battling with defender Patrick Ianni, got his head just in front and struck the ball solidly inside the right post.
"When David Beckham is given time and Landon is running off the ball, that's a dangerous combination," Houston coach Dominic Kinnear said.
Kinnear quipped, "When he (Beckham) has time, let's face it, he's a pretty good passer."
Galaxy coach Ruud Gullit said Beckham and Donovan showed great leadership, especially at halftime and in the second half after the team was relatively listless in the first half.
"We had no fight, no urgency in the first half," Beckham said. "We had some fire in the second half."
Beckham has a goal and three assists for Los Angeles (1-2-1).
Houston's Brad Davis opened the scoring when he finished off a pinball-like play involving four Dynamo players in the 36th minute.
Brian Mullen made a crossing pass from the right side, Caraccio's header bounced in the box, Ching ticked the ball as he missed a volley try, leaving the ball in front of Davis and he quickly banged it into the back of the net.
"I thought we played a good game, on the road, to come out with a point," Davis said. "We're happy, kind of."