I do not have a CAML Builder installed so just wanted to freehand this code. However I find that it is failing.
<View>
<Query>
<Where>
<And>
<Leq>
<FieldRef Name=\'StartDate\' />
<Value Type=\'DateTime\'><Today />
</Value>
</Leq>
</And>
<And>
<Eq>
<FieldRef Name="_ModerationStatus" />
<Value Type="ModStat">0</Value>
</Eq>
</And>
</Where>
<OrderBy>
<FieldRef Name=\'StartDate\' Ascending=\'FALSE\'/>
</OrderBy>
</Query>
<RowLimit>1</RowLimit>