\begin{table}[htbp] 
\centering 
\caption{\bf NP-Scores of State Legislators, by Party (Threshold to Define Pools = 25 Percent)} 
\label{tbl_summary_stats_25} 
\begin{tabular}{lccrccr} 
\toprule\toprule 
& \multicolumn{3}{c}{Democrats} & \multicolumn{3}{c}{~Republicans} \\ [.05in] 
            & Mean       & Median     &           & ~Mean       & Median     &           \\ 
Item        & NP-Score   & NP-Score   & \# Legs.  & ~NP-Score   & NP-Score   & \# Legs.  \\ [.01in] 
\midrule 
National Average/Median     & -0.80 & -0.81 & 43,452 & ~0.75 & 0.76 & 44,333 \\ [.01in] 
\midrule 
            &    &    & \# Pools  &    &    & \# Pools  \\ [.01in] 
\midrule 
All Pools                   & -0.87 & -0.88 &  3,913 & ~0.74 & 0.79 &  3,704 \\ [.01in] 
Pools in Safe Districts     & -1.16 & -1.11 &  1,476 & ~0.91 & 0.91 &  1,690 \\ [.01in] 
Pools in Competitive Dists  & -0.85 & -0.87 &  1,015 & ~0.63 & 0.69 &  1,056 \\ [.01in] 
Pools With 1+ Cong Cand     & -0.89 & -0.94 &    274 & ~0.77 & 0.79 &    358 \\ [.01in] 
Pools With 0 Cong Cands     & -0.87 & -0.87 &  3,639 & ~0.74 & 0.79 &  3,346 \\ [.01in] 
\midrule 
National Std. Dev.          & 0.52 & &  & ~0.39 & &  \\ [.01in] 
Avg. Within-State Std. Dev. & 0.32 & &  & ~0.28 & &  \\ [.01in] 
Avg. Within-Pool Std. Dev.  & 0.27 & &  & ~0.25 & &  \\ [.01in] 
\bottomrule 
\multicolumn{7}{p{.9\textwidth}}{In the first row the unit of observation is the individual legislator.  In rows 2-6 the unit of observation is the pool.}
\end{tabular} 
\end{table} 
