Gravis Marketing, a nonpartisan research firm, conducted a random survey of 1,038 likely Republican Primary voters and 1,026 likely Democratic Primary voters. The poll has a margin of error of ± 3.0% for Republicans and ± 3.1% for Democrats, all at the 95% confidence level. The poll was conducted from April 17th through the 18th. The total may not round to 100% because of rounding. The polls were conducted using automated telephone calls (IVR technology), with the results weighted by relevant voting demographics.