Charlie Riedel, File, Associated Press
DES MOINES, Iowa — An Iowa caucus campaign that has cycled through several Republican presidential front-runners entered its final week Monday, as unpredictable as the day conservatives began competing to emerge as Mitt Romney's chief rival.
Romney, the former Massachusetts governor, released a new television commercial for the state in which he cited a "moral imperative for America to stop spending more money than we take in. It's killing jobs," he said.
Texas Gov. Rick Perry countered with an advertisement that said four of his rivals combined — none of them Romney — have served 63 years in Congress, "leaving us with debt, earmarks and bailouts."
Former Pennsylvania Sen. Rick Santorum, who has invested more time in Iowa than any other contender, was the only one in the state during the day.
That changes Tuesday, with bus tours planned by Perry, former House Speaker Newt Gingrich and Minnesota Rep. Michele Bachmann, all eager to energize their existing supporters and attract new ones.
Texas Rep. Ron Paul arrives Wednesday. Recent polls suggest he is peaking as caucus day approaches, and in some surveys is tied with Romney or even ahead.
The result figures to be a short but intense stretch of campaigning through small towns and even smaller towns, the sort of one-on-one politicking that has largely vanished in the electronic age.
Failing that, it will pay tribute to the types cuisine that prosper in early 21st century America.
The Perry bus will belly up to Doughy Joey's in Waterloo and to the Fainting Goat in Waverly, an establishment whose website says "After 10 p.m., we are the type of place your mothers warned you about." Perry also will visit a vineyard and winery in Carroll.
Bachmann will make an early-winter stop at a Dairy Queen, as well as Pizza Ranch establishments in Harlan, Red Oak and Atlantic, three localities with a combined population of 17,282.
It's not all about the food, though.
Perry has a stop arranged at the Glenn Miller Museum in Clarinda, population 5,301, where the great bandleader was born.
The Texas governor also has a distinction that none of his rivals can boast, a town that shares his name. Thus, Perry will visit Perry.
There were signs of strategic shifts as candidates struggled to stand out in advance of the straw poll next week that inaugurates the round of primaries and caucuses that will pick a nominee to oppose President Barack Obama next fall.
Perry's new ad shows images of Gingrich, Paul, Santorum and Bachmann as it criticizes Congress and renews the governor's call for halving lawmakers' pay and time spent in Washington.
Despite the commercial's implication, Gingrich and Santorum were out of Congress when the multibillion-dollar financial bailouts of 2008 occurred. Paul and Bachmann voted against the legislation.
Still, the approach taken suggests the Texas governor is more concerned with outpacing Paul, Bachmann, Santorum and Gingrich on caucus night that he is in defeating Romney.
The former Massachusetts governor, making his second try for the White House, has a well-funded and well-organized campaign nationally and in Iowa, as well as allies who are spending heavily on television advertisements through an independent organization known as a super PAC.
While others have periodically risen to challenge him, Romney has kept his support from seriously eroding in the polls, consistently remaining near the top.
A victory in Iowa does not necessarily translate into the Republican presidential nomination. Yet history suggests that contenders who finish farthest behind next week will quickly drop out, underscoring the significance of the struggle to emerge as Romney's chief rival.
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