A Republican strategist who worked on George Romney's three successful runs for governor of Michigan has issued a dramatic plea to his son Mitt Romney: "Go to Cleveland, Mitt. Your dad would be proud."Walter DeVries writes in a Boston Globe opinion piece that there is no downside for the two-time presidential candidate and former governor of Massachusetts to attend the Republican National Convention in a bid to try to spoil the nomination of Donald Trump."If Mitt really wants to be a leader, he will have to go to the convention. Even if he and other GOP leaders can't stop Trump's nomination, they should at least try to write a platform that state and local Republican candidates across the country can live with," says DeVries, 86."A half century ago, George Romney went to the Republican convention to fight the nomination of Barry Goldwater, a radical who had taken over the party."Now Mitt Romney has a chance to follow in his father's footsteps, to stop someone who has built his campaign around demeaning the vulnerable and banning whole groups of people from entering the country."DeVries, founder of the North Carolina Institute of Political Leadership, is author of "The Ticket-Splitter: A New Force in American Politics."