Elections are contests held during a moment in time between candidates who have records stretching back, often far back, into the past. So there is always a tension between the man (or woman) who is running and the moment.
That tension is greater than usual when the contest is for the nomination of a political party dominated by a large number of newcomers to politics motivated by strong opposition to current policies.
That was the case 40 years ago, when members of the peace movement, opposed to the Vietnam War, became the largest and most highly motivated part of the Democratic Party.
And it is the case this year because the political newcomers referred to as the tea party have become the most highly motivated part of the Republican Party. They are opposed to the Obama Democrats' vast expansion of the size and scope of government and to any policy that abets it.
The Republican candidates, who had their first real test in this week's Iowa caucuses, have long political records, going back to the 1970s in the case of Newt Gingrich and Ron Paul, and all of them (or all but one) have taken stands in tension with the principles of this cycle's Republican voters.
Some have backed a mandate to buy health insurance -- a conservative proposal in the 1990s. At least one championed spending earmarks. Some are vulnerable to charges of crony capitalism. Some have disparaged or declined to support the Medicare reforms in House Budget Chairman Paul Ryan's budget package.
Ron Paul, a libertarian on economics, is far out of line with most Republicans on foreign policy. The one candidate most in line with the tea party, Michele Bachmann, is the one with the thinnest resume, with five years as a backbencher in the House of Representatives.
The Republican race has been described by many as the rise and fall of various conservatives as the alternative to the supposed moderate Mitt Romney. But Romney has been emphasizing tea party themes, invoking the Founding Fathers and contrasting Obama's entitlement society with his merit society.
As this was written, the final results were not yet in from Iowa. But with 90 percent of the vote counted, Mitt Romney and Rick Santorum were running neck and neck, with Ron Paul in third and Gingrich, Rick Perry and Bachmann far behind.
The entrance poll showed Romney running not far behind Paul and Santorum among the nearly two-thirds of caucus-goers who said they supported the tea party movement, and winning about half the votes of the one-third of caucus-goers who said they wanted to support the most electable candidate.