The Rhodes Cook Letter for March 2016 has a tally of the number of votes received by leading Democrats and Republicans in presidential primaries and caucuses this year, through March 31.
For Democrats, the tally is: Hillary Clinton 8,967,408; Bernie Sanders 6,435,176; others 291,236.
For Republicans: Donald Trump 7,866,167; Ted Cruz 5,778,761; Marco Rubio 3,445,744; John Kasich 2,824,519; Ben Carson 694,249; Jeb Bush 254,544; others 303,313.
These figures do not include these April events that have already occurred: the North Dakota Republican caucus of April 1, the Wisconsin primary of April 5, the Wyoming Democratic caucus of April 9, or the New York primaries.
The Rhodes Cook Letter is published by Rhodes Cook, who also authors America Votes every two years, the best source for election returns for federal office and gubernatorial elections. The Rhodes Cook Letter is published six times per year and costs $99. Contact the letter at PO Box 574, Annandale Va 22003.