After medical school, Rep. Ron Paul was an Air Force flight surgeon.

In 1968, he moved to Texas to open his OB-GYN practice.

Since then, he's delivered more than 4000 babies.

Doctor Paul was first elected to the House in 1976.

He stepped down in 1984 and returned in 1996.

Paul opposes allowing illegal immigrants to earn U.S. citizenship, although he's acknowledged deporting every one would be impractical.

He voted in favor of building a 700-mile fence along the U.S.-Mexican border.

Paul is among the few Republicans who opposed the president's Iraq policy from the beginning.

He voted against the use of military force.

He was against sending more troops.

He also said a military victory is "unattainable."

Rep. Paul supports the so-called "fair tax," which would eliminate the Internal Revenue Service and replace the income tax with a national sales tax.

He signed a pledge not to raise taxes, supported Bush's tax cuts and wants to reduce government spending.