Dozens of members of Tunisia’s largest opposition party were arrested this week ahead of the formal start of campaign season for the North African state’s presidential election, lawyers and officials from the party said on Friday. Ennahda, the Islamist party that rose to power in the aftermath of the country’s Arab Spring, said on Friday that tallies collected by its local branches suggested at least 80 men and women from the party had been apprehended as part of a countrywide sweep that ensnared members from 10 regions. For weeks democracy and human rights advocates have been calling on the E…