DES MOINES  – With a nationally focused campaign that leans on strong debate performances and television advertising, Marco Rubio isn’t going all out in any one of the early voting states.

That’s raised eyebrows among Republicans in states such as Iowa, where people are used to being lavished with attention in a presidential campaign.

As 2015 wanes, the Florida senator is back in Iowa on Tuesday for a multi-day swing, hoping to shore up support and finish in the top tier of candidates in the Feb. 1 caucuses.

But he is continuing to spread his time and money across the early states, showing no indication he will choose just one to make his mark.

That’s unlike Texas Sen. Ted Cruz, who has set his sights on Iowa, and former Florida Gov. Jeb Bush, who is pushing hard in New Hampshire.