The Big Conversation:

The escalating fight between Newt Gingrich and Mitt Romney has spawned an unlikely Texas alliance (of sorts).

As the Houston Chronicle observes, the rise of Gingrich — still leading in most early-state and national polls — and Romney's continued hold on second place may unite Rick Perry and Ron Paul at tonight's Republican debate in Sioux City, Iowa, the last such event before the Jan. 3 Iowa caucuses.

The two Texans, both looking for traction in Iowa and beyond, will likely aim their attacks at the two front-runners.

Paul — who has recently drawn attention for his rise ...

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