Table:
text: Opinion polling for the United States Senate elections, 2008
Alaska
Alaska
Poll_Source Dates_administered Democrat_Mark_Begich Republican_Ted_Stevens Lead_Maragin
Rasmussen Reports July 17, 2008 52% 44% 8
Research 2000/Daily Kos July 14–16, 2008 47% 45% 2
Rasmussen Reports June 16, 2008 44% 46% 2
Rasmussen Reports May 14, 2008 47% 45% 2
Research 2000 May 12–14, 2008 48% 43% 5
Hellenthal & Associates, DSCC * May 6–10, 2008 51% 44% 7
Rasmussen Reports April 7, 2008 45% 46% 1

Question: In the Alaska elections of July 17, 2008, what was the total number of leading Maragines in the opinion polls for the 2008 United States Senate elections?