Question about some interesting OH primary election results:

[mod mom]

I heard a story on local NPR station that sitting Governor Strickland received over 100,000 less votes than his republican opponent, Kasich, although they said you couldn't infer much from these numbers. They also said a poll showed that the majority of voters didn't know enough about Kasich. I went to the OH SOS website and found these results:

Governors Race:

Strickland (D) 620,963
Kasich (R) 735,790 difference of 114,827


Senate Race:

Fisher (D) 374,633
Brunner (D) 298,964 Dem total= 673,597

Portman (R) 657,354

My question is why did over 50,000 Dems elect to not vote for Strickland? Does this show a problem or since he was unopposed did they not bother? Also, seeing much lower Dem turnout are the Dems looking at a problem in November? There was a very heated ( Fisher was endorsed by the DSCC way before primary and almost by the ODP before a 74,000 voter campaign stopped the ODP endorsement. There was also a late hour false accusation run in papers by a Fisher endorser against the progressive Brunner saying she was a bad Dem for not saying she would endorse/work for Fisher when she said her role as OH SOS would not allow her to endorse any candidate while she oversaw the election) Senate race in the Dem primary that left many progressive feeling alienated from the ODP. Shouldn't the Dem Party be worried?