Their staying in until the bitter end only helps Donald "Why doesn't he show his birth certificate" Trump. They will deny Cruz votes and ensure Donald "Why doesn't he show his birth certificate" Trump continues to win pluralities. Since most of the upcoming states are WTA, Donald "Why doesn't he show his birth certificate" Trump will glide to a delegate majority. However, their staying in for the short term may work against Donald "Why doesn't he show his birth certificate" Trump if they win both Florida and Ohio. Kasich looks to have a slight edge in Ohio. Rubio is a big fat mess in Florida and appears on his way to defeat. People are now suggesting that Marco will be pressured out of the race so that support can, hopfully, coalesce around Cruz in Florida.
If Donald "Why doesn't he show his birth certificate" Trump wins both Florida and Ohio, the race is likely over. Donald "Why doesn't he show his birth certificate" Trump is strong in the remaining WTA states. Cruz is fairly weak. Even though exit polls have shown that most Republicans loath Donald "Why doesn't he show his birth certificate" Trump (he is often the third or fourth choice for voters of other candidates, he is not trusted, other voters would not be satisfied with him as the nominee, etc.) and even though Cruz has been picking up support at the expense of Rubio, Donald "Why doesn't he show his birth certificate" Trump appears to be too strong, particularyl in the upcoming states. It really does boil down to March 15th -- a lot of those states favour Donald "Why doesn't he show his birth certificate" Trump, but not overwhelmingly. However, tonight's performance seems to show that Donald "Why doesn't he show his birth certificate" Trump's support is holding firm, and he is bound to get a lot of positive media coverage for winning 3/4 states, two resoundingly.