Washington ? President Barack Obama shared some words of wisdom on Saturday, saying there are few things in life harder to find and more important to keep than love.

“Well, love and a birth certificate,” Obama quipped at the White House Correspondents’ Association dinner, poking fun at those who question his place of birth. “I happen to know that my approval ratings are still very high in the country of my birth.” Obama was born in Hawaii, but birthers question whether he was born overseas.

Obama also jabbed Jay Leno, the comedian headlining the dinner. Obama dinged Leno as “the only person whose ratings fell more than mine.”

He said he was glad he spoke before the television host, “because we have all seen what happens when somebody takes the time slot after Leno.” Comic Conan O’Brien left NBC after his stint hosting “The Tonight Show” following Leno didn’t work out.

He took aim at his own administration too, cracking jokes about Vice President Joe Biden and his chief of staff Rahm Emanuel.

Republicans were also the victims of many Obama punch lines. The president noted Sen. John McCain’s claim this year that he was not identified as a maverick. “We all know what happens in Arizona when you don’t have ID. … Adios amigos,” Obama quipped, referring to a new law in the state that targets illegal immigration.

He wasn’t hesitant to mention the attention-hungry couple who crashed his state dinner last fall. “Odds are that the Salahis are here. There haven’t been people that were more unwelcome at a party since Charlie Crist,” he said about the Florida governor who decided to defect from the Republican party.

Although his poll numbers are down, Obama said he hears he’s popular on Twitter and Facebook. “Or as Sarah Palin calls it, the socialized media,” he said.

Leno picked up on this joke to take a dig at Obama, saying the president isn’t as aloof as some critics say he is. “He loves to socialize — health care, car companies,” Leno said, naming a few industries where the Obama administration has intervened.

Among the 3,000 guests on hand included Olympic gold medalist Lindsey Vonn, comedian Chevy Chase, actor Alec Baldwin, comedian Bill Maher, actress Michelle Pfeiffer, actor Dennis Quaid, former Secretary of State Colin Powell, GOP Chairman Michael Steele, New York Mayor Michael Bloomberg, White House senior adviser David Axelrod, the Jonas brothers and pop star Justin Bieber.