Obama said Texas' neighbors had looked at the Medicaid expansion, which is fully funded by the federal government for the first few years, as a no-brainer.

""Why wouldn't the state of Texas want to do the same thing?" he asked later at a fundraiser for the Democratic Senatorial Campaign Committee." Well, it's because ideology has taken precedence over common sense and helping people."

The trip to Texas — initially scheduled only as a fundraising visit — comes as his administration seeks to mitigate the damage from the website glitches and from a public outcry over a promise he repeatedly made — if you like your insurance, you can keep it — that turned out to be incorrect for millions of Americans.

Before leaving Washington on Wednesday, Obama tried to soothe the concerns of 16 Senate Democrats facing re-election next year during a two-hour White House meeting. Many of those lawmakers are worried that the problem-plagued rollout could negatively affect their races.

Later, at one of two fundraisers, he said: "It is fair to say that right now I'm not happy with some IT people in Washington."

Highlighting the law's benefits at Dallas Temple Emanu-El, Obama encouraged participation in the marketplaces set up by the law. He said nothing drives him crazier than knowing there's good insurance available – if only the website would work properly.

"This is like having a really good product in a store, and the cash registers don't work, and there aren't enough parking spots," Obama said.

"I know that sometimes this task is especially challenging here in the great Lone Star State," Obama said to laughter. "But I think all of you understand that there's no state that actually needs this more than Texas."

Perry shot back, accusing Obama in a statement of trying to "salvage his ill-conceived and unpopular program from a Titanic fate."

"Texans aren't the reason Obamacare is crumbling," Perry said. "Obamacare is the reason Obamacare is crumbling."

Texas also is among the 36 states not providing their own insurance marketplaces, which means residents there must sign up through the federal website that stumbled badly upon its launch Oct. 1.

Back in Washington, Health and Human Services Secretary Kathleen Sebelius faced heated questioning from senators, some of whom challenged her honesty and demanded she resign. Focusing on progress made, Sebelius said the web portal now is handling large volumes of material with fewer errors even as she acknowledged "we're not where we need to be."

Obama has been aggressively promoting the law in the face of numerous setbacks. In addition to the problem-plagued enrollment launch, insurers have been sending some of their customers termination notices because their policies don't meet federal requirements.

The notices have put Obama and White House officials on the defensive as they attempt to explain Obama's early vow that under the new law, people who like their existing coverage would be allowed to keep it.