Over the last two days, this tweet in support of Ted Cruz has been tweeted 9635 times by 9014 accounts. Let's take a look. 
Very few of the accounts look like bots based on 24 hour activity/use of automation services (and there's a helpful button to make the tweet easy for humans to copy). There's a big caveat though - many of the accounts have too few tweets to perform this test.
Of the 9014 accounts that duplicated the tweet, 908 (9.4%) have default profile pics, and 1610 (16.7%) have fewer than 100 followers. This doesn't prove the accounts are automated, but does suggest the presence of sockpuppets, whether human or automated.
One more thing: only slightly over a quarter of the accounts that give location information on their profiles actually seem to be from Texas. This includes the very first account we found that posted the tweet, @kevinobrien1963, which claims Chicago residence.
Thanks @ZellaQuixote for assistance with this thread.
I will note that none of these intellectually stimulating replies address the curious fact that patient zero for this spammy Twitter campaign is an account with 355 followers from (apparently) Chicago, which is rather lacking in Ted Cruz constituents last time I checked a map.
