In it (you can look it up on his Facebook page if you want to see it), Patrick compares his spending with Dewhurst's, showing that Dewhurst outspent him $100 million to $5 million "campaigning for state office." Given that Patrick compared his spending to Dewhurst's, you'd be justified in concluding that the two figures were both for the Lt. Governor's race this year. Most people I showed the graphic to assumed that it was comparing spending in the Lt. Governor's race this year. They were wrong. Notice that the heading was "total spent campaigning for state office" - Patrick included every dollar Dewhurst ever spent running for state office, and compared it to Patrick's spending in one race.
I've seen a lot from Dan Patrick, but this one was particularly jaw-dropping.
For Dewhurst to have spent $100 million on statewide races, he would have to have averaged $25 million dollars per race. Given that this primary is only the second hard-fought election Dewhurst has been in, that is extremely unlikely.