Wildflower Id Needed

They look a bit like cornflowers.

Knapweed?

Yep, I vote for cornflowers too. They are everywhere here too.

Hi Les - They look like Wild Bergamot - Monarda

Thank you all!
The flower heads look like knapweed or wild bergamot, but both these plants have smooth, soft, and well defined leaves.
Today, I went back and had a closer look at those plants. They have ragged, hard, and prickly leaves, like some thistles, so based on the appearance of leaves, I would think, it's some thistle variety.

Les.. did you take a close up picture while you were there? ;O)

Yes, Bob, I took a few more pictures. I added another image to my original post, and below is the same image uploaded to FAA, viewable at 100%.
The telling feature is the spiny leaf. I touched one and the leaf tips were very sharp.

I think it is the American Star-thistle.

I'm thinking Hill's Thistle which is not as common as others

I'm wondering if it's a type of Canada thistle. They grow in clusters of fuzzy blossoms that turn into enormous poofs of fluff. We have huge swathes of them blooming and going to seed right now - acres and acres of fluffy puffs in all the meadows. Canada thistle appears to be rather invasive, and it's doing a super job of it this year, but I can't hate it because the goldfinches love it. Still waiting to get that perfect shot of a goldfinch with a mouthful of fluff.

Well, I learned a lot in the last 24 hours about thistles (and other plants).

Alfred,
The American Start Thistle looks very similar, but according to http://www.wildflower.org/plants/result.php?id_plant=CEAM2

"The plant looks similar to the thistles but lacks their prickly characteristics". So, that would disqualify it.

M.E.
Canada thistle seems bigger, with not as delicate flowers, and the bottom part of the flowerhead (bud?) is green. The flowers are bright (raspberry) pink.
This plant's buds are burgundy colored, and the flowers are something between pale pink and lavender.

Debbie,
thank you for your persistence. Indeed, it could be Hill's Thistle, which by the way, is endangered species in some regions.

http://dnr.wi.gov/topic/EndangeredResources/Plants.asp?mode=detail&SpecCode=PDAST2E1C0