Rep. Anh "Joseph" Cao, R-La., was the only House Republican to vote in favor of the Democratic health care overhaul Saturday, according to CNN.
Cao made his decision after a personal call from President Barack Obama around noon on Saturday, CNN said.
The final vote on the health care bill came down to 220 to 215 in favor, Newsweek said.
Despite Republican criticism, Cao said he made "the right decision based on my conscience"--he supported the bill only after the addition of an amendment that banned coverage of most abortions under the public option, according to CNN.
Cao represents one of the most impoverished regions of southern Louisiana, which includes areas that surround New Orleans, an area still recovering from Hurricane Katrina, Newsweek said.