A front-page article about Senator Schumer makes mention of "Tom Coburn of Oklahoma, one of the Senate's most unyielding conservatives."
Maybe by New York Times standards Senator Coburn is "unyielding," but by Smartertimes standards, he's a bit of a squish.
His Wikipedia entry reports that he twice voted against funding the war in Iraq and described the war as a mistake. He's called for additional revenues to balance the budget — a euphemism for tax increases — and said of President Obama, "I love the man." He voted to end the filibuster of Senator Hagel's nomination to be defense secretary.