Sample tweet: "Quit complaining abt my Twitter shorthand I know how to spell But Twitter limit is 120 characters"
The Iowa Senator is one of the chamber's longest-serving members. But that doesn't mean Chuck Grassley has fallen behind the times with social-media platforms like Facebook and Twitter. Grassley's so with it, he even made an ad about his Twitter proficiency during the 2010 midterms. And he's not afraid to let loose online either. In July 2009, Grassley blasted Obama's "nerve" to go sightseeing in Paris while simultaneously urging Congress to move forward on health care reform.