[...] for all the flurry of activity in the GOP race, set off last month by former Florida Gov. Jeb Bush and amplified by 2012 nominee Mitt Romney, some of the party's most sought-after donors appear content to let things shake out a bit before making a commitment to any one candidate. For many of the party's biggest fundraisers, signing on with a contender is a two-year commitment that usually includes asking friends, family and colleagues for donations they can bundle into stacks of checks. The ranks of unaligned major donors include several top players in the party, including hedge fund investors Paul Singer and Robert Mercer, New York Jets owner Woody Johnson and casino magnate Sheldon Adelson. The political machine backed by the billionaire Koch brothers on Monday told their most-loyal supporters they intend to raise and spend close to $900 million during the 2016 campaign, a sum that would more than double what the Republican National Committee spent on the 2012 election. Christie took his most decisive step yet toward a bid early Monday when he announced the formation of a political action committee, which will essentially serve as a campaign-in-waiting. The former Massachusetts governor collected an average of $215,000 each day from the time he started raising money in 2011 until the start of 2012, a total that ended up at more than $57 million before the first votes were even cast. Joe Biden raise money for his unsuccessful 2008 primary, said he often saw some of his donors also appear on the campaign finance reports of Barack Obama, Hillary Rodham Clinton and John Edwards.