But the guy that lost did just what you suggested.....you may think attacking each other and not the Dems are the way to win, but it’s NOT.....that NEVER works for Republicans. Ever.
The guy that lost (first McCain, then Romney) was a leftist Republican attacking Republicans like me for refusing to vote for Republicans who advance government tyranny.
They lost because they were too inclined to see government as the solution. They could attack Obama and the Democrats until they were blue in the face after the primaries, and voters were indifferent.
Republican presidential primaries aren't about choosing the Republican who does the best job of attacking Democrats -- we've seen what happens when it is: the candidates lose the general.
The Republican primaries are about choosing the Republican who does the best job of advancing Republican principles and values of limited government. That necessarily means attacking Republicans such as Romney and Jeb who advance principles and values of government tyranny as usual.
That attacking Democrats is the focus of Republican presidential primaries is no doubt a big part of the reason the Republican party has failed so miserably in selecting a conservative candidate.