Not if Seinfeld or Pryor encouraged us to use their words, which is the case with Deval Patrick and Obama.
” nor should we allow those... who would prove the full measure of devotion with their blood, to make such an awful sacrifice in vain.”
And here is the same language from the Gettysburg Address:
“that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion - that we here highly resolve that these dead shall not have died in vain.”
The plagiarism charge is on point. This would have been better if it had been an October surprise though. Sources are listed below.
http://www.barackobama.com/2002/10/02/remarks_of_illinois_state_sen.php
http://showcase.netins.net/web/creative/lincoln/speeches/gettysburg.htm