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Keller @ Large: Can Trump Be Stopped?

BOSTON (CBS) - "If you listen to the pundits, we weren't expected to win too much, and now we're winning, winning, winning the country!"

Donald Trump was gloating Tuesday night as he swept the Nevada voting, and why shouldn't he? His once-ridiculed campaign now looks unstoppable.

Or is it?

There's big-time pressure on also-rans like John Kasich to drop out now, and with good reason. Look at the GOP electorate in the Real Clear Politics average of national polls: Trump has the single largest slice at 34 percent. But the Ted Cruz and Marco Rubio slices together are larger than Trump's. Add in the Kasich and Ben Carson portions, and a solid majority of this pie can't stomach Trump.

But his opponents seem disinclined to do much about it. Rubio and Cruz rarely attack Trump, and when they do it's mostly with lame bromides like this from Cruz the other day: "I frankly don't care what position Donald decides to support today, or tomorrow or the next day. They change every day."

In this campaign of white-hot insults, that won't break through.

And while anti-Trump groups like the Club for Growth are pouring money into ads challenging Trump's conservative credentials, they are making little apparent impact.

Look to see if that changes in Thursday night's final pre-Super Tuesday GOP debate. If it doesn't, it seems unlikely the Trump express will be derailed.

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