Tea party favorite Sen. Rand Paul says despite what the Supreme Court says, Obamacare is unconstitutional.

The freshman from Kentucky told the GOP convention that the only way to turn back President Obama's health care overhaul, is to elect a new president. Paul has endorsed Romney.

The convention featured a video tribute to Paul's father, Texas Rep. Ron Paul, the brash libertarian and former Romney rival with a passionate following who failed to win a GOP presidential primary. The elder Paul stopped short of endorsing Romney and didn't get a convention speaking slot.

Rand Paul, who was not the GOP establishment's choice when he ran for Senate, is urging his father's backers to stay loyal to the GOP.