Marcus Dorsey allegedly told investigators he saw the woman crossing the street and that she tried to get out of the way but he "gunned it."
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The initiative needs 62,507 verified signatures to make the November 4 ballot.
The Republican nominee released the ad on Monday that stars his granddaughter.
Group presents arguments to the Arkansas Supreme Court.
Democratic candidate for Arkansas governor says his proposal aims to support, protect and empower the state's seniors.
Republican challenger for Mark Pryor's U.S. Senate seat tells group about his support for the VA funding bill.