Here’s what they bring: Connections built up over years of political power. Contacts, names and phone numbers of people who can get out the vote and know districts and neighborhoods. Just because the guys driving the machine are not the people you like, you like the machine they drive.
Elections aren’t normally about filling stadiums and getting free tv time. If you know you aren’t going to get things done that way you stick with what you know works. People can dismiss that all you want as being paid for, but the reality is a whole lot of work is done by a whole lot of volunteers and when you can pick up that work for free, you grab it.
If trump was building a skyscraper and needed more materials or people and one of his competitors had those people - he would engage his competitor for the resources he needs to complete the contract. -— Same thing.
Jeb wants to get back at Trump for crashing his party.
Ted maybe owes a favor or two to the Bushes, & they have plenty of connections that could help or hurt him.
Cruz/Bush will never win the general.
Ted Cruz is a snake in the grass. I will not vote for him if he's the nominee.