Big-name contenders may perform ‘a lot of verbal gymnastics’, but campaign funding limits come into play as soon as money does, transparency advocates sayThe dinner invitations that dropped into the inboxes of political donors last week proudly boasted a list of guests whose names have already become very familiar in the crowded race for the Republican presidential nomination.Jeb Bush, Scott Walker and Rick Santorum are among nine confirmed speakers for the Iowa Republican party’s annual Lincoln dinner in Des Moines.