Ted Cruz’s failure to endorse rival Donald Trump for president at last week’s Republican National Convention in Cleveland, Ohio has apparently caused his favorability rating among GOP voters to collapse, according to a national survey and an Ohio poll.

An NBC News/Survey Monkey nationwide poll released Tuesday and a PPP survey of Ohio Republicans released Monday confirms the shocking collapse in Cruz’ favorability rating among Republican voters following the convention seen in a CNN/ORC poll released Monday.

CNN/ORC:

“Cruz’s move, however, appears to have backfired. While 60% of Republican voters had a positive impression of the former presidential candidate before the convention, just 33% have one now.”

NBC News/Survey Monkey:

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“Ted Cruz, who scored a strong round of boos when he declined to endorse Trump in his speech to the RNC, was not viewed kindly by Republicans voters. Though Cruz finished second in the GOP primary race, just 28 percent of members of his own party now view him favorably; 68 percent now view him unfavorably. Clearly, his performance at the GOP convention was not received well by his party.”

PPP Ohio:

“The biggest loser from the convention is Ted Cruz though. He has an 18/65 favorability rating with Ohio voters, making him by far and away the least popular figure in our poll. Even among Republicans he’s at just 23/61. We asked GOP voters who they would support in a hypothetical primary contest between Trump and Cruz, and Trump wins out 61-19.”