The Invisible Primary, 6/10

Tracking the GOP race to 2010

David Letterman's jokes about Sarah Palin and her daughter--and Palin's response--made headlines in blogs and news outlets; Charlie Crist signed a health insurance reform bill; Eric Cantor said the GOP has a good shot at taking back the House in 2010; and Newt Gingrich finished behing Rush Limbaugh in a USA Today/Gallup poll on who speaks for the GOP.