Trump leads Marco Rubio 35-30 percent ahead of the March 15 primary, according to the poll conducted for Our Principles PAC by The Tarrance Group, a Republican firm, and obtained by the Miami Herald. Ted Cruz drew 16 percent support, John Kasich 9 percent and Ben Carson 5 percent. (Carson formally dropped out Friday.) Six percent of respondents were undecided.

Earlier polls by other firms have suggested a wider — in some cases, much wider — margin between Trump and Rubio. The Democratic-leaning Public Policy Polling found Trump ahead by 20 percentage points, Quinnipiac University by 16 points and Associated Industries of Florida by 7 points. All those polls were conducted last week, before Our Priorities and two other groups — American Future Fund and Club for Growth — unleashed their anti-Trump advertising…

The new poll offered a glimmer of hope for Rubio in that he continues to have the most favorable rating among all the candidates. That gives him the most room to grow among undecided voters; according to the poll, 24 percent of respondents are still picking a candidate. Sixteen percent are leaning toward one, and 57 percent have already decided.