If there is a third tier, it would include former Sen. Rick Santorum of Pennsylvania, who was defeated for re-election in 2006, and Congresswoman Michele Bachman of Minnesota.

如果有第三阶梯候选人，还应包括前美国宾夕法尼亚州参议员里克山托兰，他在2006年第二次参选中落选，还有明尼苏达州众议员米歇尔·巴赫曼。

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John Wilkins finds some irony in press coverage critical of Republican presidential candidate Rick Santorum.

FORBES: Rick Santorum and the 13th Century

Rick Santorum of Pennsylvania suspended his presidential campaign, which made Romney the presumptive GOP nominee.

CNN: Under GOP attack, Obama talks jobs and raises money

The current furore was provoked by Rick Santorum, the third-ranking Republican in the Senate.

ECONOMIST: George Bush and the social conservatives