I wonder if Cruz could carry 3 of the 4 votes against Clinton?
In Maine? Cruz won't get 40% of the vote there. The only state that could reasonably split its electoral votes in November is Nebraska. Not that there are any polls out to suggest that such will happen, such happened in 2008, when Barack Obama won the Second Congressional District of Nebraska.
NE-01 (eastern Nebraska, including Lincoln but excluding most of Greater Omaha) votes like Kansas.
NE-02 (Greater Omaha) votes much like Indiana.
NE-03 (thinly-populated central and western Nebraska, including Grand Island and Scottsbluff) votes much like Wyoming.
The state on the whole is one of the most R-leaning states in the US and has not gone for a Democratic nominee since 1964.