Has there been any primaries candidate that has "unsuspended", i.e. resumed the race after previously announcing a suspension?
An example when this happened with a suspension of several months is Gary Hart's bid for Democratic nomination in 1988.
Hart was the clear frontrunner for the Democratic nomination in the 1988 election. Hart officially declared his candidacy on April 13, 1987.
However, he would suspend his campaign on May 8, 1987, after newspapers had been revealing Hart's extra-marital affairs.
"I said that I bend, but I don't break, and believe me, I'm not broken. (...) Clearly, under the present circumstances, this campaign cannot go on."
He stayed away from the campaign trail for 7 months, until
In December 1987, Hart returned to the race, declaring on the steps of New Hampshire Statehouse, "Let's let the people decide!"
However, the people wouldn't decide in his favor.
After the Super Tuesday contests on March 8, in which he won no more than 5 percent of the vote, Hart withdrew from the campaign a second time.
Finally Michael Dukakis became the Democratic nominee, and lost in the general election to Republican George H.W. Bush.