Sen. Lisa Murkowski, R-Alaska, gestures as she leaves the Senate chamber after the vote on witnesses during the impeachment trial of President Donald Trump at the U.S. Capitol Friday, Jan. 31 in Washington. The Senate rejected the idea of summoning witnesses for President Donald Trump’s impeachment trial late Friday, all but ensuring his acquittal. (AP Photo | Steve Helber)

Sen. Lisa Murkowski, R-Alaska, gestures as she leaves the Senate chamber after the vote on witnesses during the impeachment trial of President Donald Trump at the U.S. Capitol Friday, Jan. 31 in Washington. The Senate rejected the idea of summoning witnesses for President Donald Trump’s impeachment trial late Friday, all but ensuring his acquittal. (AP Photo | Steve Helber)

Opinion: A failure of conscience and courage

The blame rests squarely on her shoulders.

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