Paul: Yes, headlined luncheon in April at Boston-area equity firm led by Romney's former national finance chairman and Romney's oldest son, Tagg, an event that drew together the 2012 presidential candidate's inner circle. Also attended Romney's 2013 Utah retreat. Has met GOP donors in New York City.
Perry: Yes, has proven an effective fundraiser, both from grassroots activists and mainstream Republicans. Has led many job-poaching missions in big states with Democratic governors and met privately during those trips with key donors, especially in New York and California.
Rubio: Yes, aggressive national fundraising outreach, including trips to New York and California to meet potential donors. Raised more money last year than potential rivals Ted Cruz and Rand Paul. Among a handful of possible candidates to attend September 2013 event at home of Woody Johnson, New York Jets' owner and Mitt Romney's national finance chairman.
Ryan: Yes, attracts Wall Street interest, attended Romney's 2013 Utah retreat, has money connections from 2012 campaign.
Santorum: 2012 shoestring campaign was largely fueled by a super political action committee to which Republican donor Foster Friess gave more than $2 million.
Walker: Yes. Addressed Republican Jewish Coalition at a Las Vegas gathering in March where main attraction was Adelson, who's looking where to place his bets in GOP field. Headlined 2013 fundraisers in New York and Connecticut.
NETWORK LIKE MAD: Taking their case to ideologues, activists and party heavyweights who hold great sway in nomination race.
Biden: And how. Says he plans to campaign in more than 100 races in the 2014 election. Meets regularly with former Senate colleagues and congressional Democrats. Gives keynote speeches at annual state Democratic Party dinners across the country. Making calls for House Democrats' campaign organization, assisting in recruitment of candidates. Campaigned for new Virginia Gov. Terry McAuliffe, Massachusetts Sen. Ed Markey. Speaks regularly to special interests.