(CNN) -- Damn those extreme Republicans. President Obama and White House press secretary Jay Carney have found Republicans guilty of extortion and blackmail. Joe Biden, per a report in Politico, once christened Republicans as terrorists. Liberals have led a media assault, calling the GOP anarchists, jihadists, "gun to head" hostage takers, and the political equivalent of the Taliban. White House advisor Dan Pfeiffer has likened Republicans to suicide bombers "with a bomb strapped to their chest." What could be more extreme? The Democratic Party. True, the Ted Cruz wing in the House of Representatives is relentless, uncompromising and unmoved by practicality. As we all know, there are perhaps 40 or so "bullet-proof Republicans" in the House, in safe GOP districts, invulnerable except to Kryptonite. They fear a fellow Republican getting to their right in a primary more than a long-shot Democratic opponent who would paint their district blue in a general election.
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Alex Castellanos: While everyone focuses on GOP's right, the Democrats are being ignored
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He argues that Democrats as a party have moved much further, in this case, to the left
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Democrats are celebrating the shift to a more liberal view of role of government, he says
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Castellanos: Elizabeth Warren wing of party could make life difficult for Hillary Clinton in 2016
No doubt, the @placeholder is a party divided, but there are a lot of Democrats in safe districts, too.
No other member of the old Democratic elite can possibly hold its left-sliding legions together, yet @placeholder has only one credential that appeals to her party: She could be our first female president.