Not nationally, but because Maine uses both Instant runoff voting for presidential elections, and the Congressional district method of assigning electors, it’s mathematically possibly for Maine to split its electors 2-2. eg, the Republican wins both districts individually, while the Democrat wins statewide. Not this year though – needs a competitive 3-way race so the runoffs matter.
I used to live in Ohio, and had three presidential candidates visit close enough to conveniently get to. I went to the Edwards, Obama (primary season), and Romney events. I didn’t order advance tickets for any of them. Both Democrats had volunteers outside the security trying to get everyone who showed up with or without tickets through security and into the main venue. At Romney’s I didn’t get in and just loitered around the outside fencing. That might have been the better experience – I could still hear the speeches, and the outside crowd had better signs and more colorful commentary than the inside ones.