Paul: Yes, and now roaming freely beyond tea party tent. Had private audience in April with Romney's 2012 campaign advisers, is helping Republicans across political spectrum, including moderate Sen. Susan Collins of Maine, and has pitched in with party leaders to heal divisions from last campaign. In April brought message of unity to state GOP convention in Maine, where a struggle over delegates created raw tensions between GOP establishment and libertarian or tea party supporters of his father in 2012 campaign. Generated buzz and won symbolic straw poll at Conservative Political Action Conference in March.
Perry: Yes, spoke at past two Conservative Political Action Conferences as well as its regional meeting in St. Louis in September. Addressed conservative activists at a RedState Gathering in New Orleans in August, mistakenly saying he was in Florida. Job-pitching tour in various states helps make connections.
Rubio: Yes, conservative and party activists, focused lately on repairing tea party relationships strained over immigration. Well-received speech to Conservative Political Action Conference in March. In Virginia governor's race, campaigned for Republican Ken Cuccinelli, who lost.
Ryan: Yes, prime networker as 2012 vice presidential candidate; now helping fellow House members raise money.
Santorum: Addressed NRA convention in April; speeches to groups around the country, including Conservative Political Action Conference. His Christian-themed film company is his calling card with religious conservatives.
Walker: One of only a few 2016 prospects who spoke to Republican Jewish Coalition. Skipped the big Conservative Political Action Conference in March, appeared there last year. Campaigned for GOP in Virginia governor's race. Spoke to Michigan Republican Leadership Conference on Mackinac Island in September 2013.
HOG THE TV: Achieving national recognition by sermonizing on the Sunday news shows, or going for soft questions and easy laughs on late-night TV.
Biden: He's back. After being largely absent from the airwaves for more than a year, Biden has resumed frequent interviews, including joint TV appearance with Obama in April. He did a TV blitz the morning after the State of the Union, a CNN interview aboard an Amtrak train and dished on his skin care routine and his wife's oddball pranks during an interview with Rachael Ray. But not a Sunday news show fixture.