WSJ [paywall] – Mistakes have occurred in the Google Transparency Report for both Democratic and Republican presidential and congressional candidates – “Google set up a searchable database of political ads last summer, following calls for greater transparency in the wake of Russia’s interference in the 2016 presidential election. Nearly a year later, the search giant’s archive of political ads is fraught with errors and delays, according to campaigns’ digital staffers and political consultants. The database, the Google Transparency Report, doesn’t always record political ads bought with Google’s ad tools and in some instances hasn’t updated for weeks at a time, they say. Several campaigns, including those of Democratic presidential hopefuls Bernie Sanders and Elizabeth Warren, have run ads in recent weeks that didn’t appear in the Google archive, people familiar with the campaigns’ ad-buying said. Such mistakes have occurred for presidential and congressional candidates in both parties. A Google spokeswoman said in a statement, “We are constantly working to improve the report and appreciate feedback on how we can make it better.”…